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Internal structural analysis of geochemical anomaly based on the content arrangement method: A case study of copper stream sediment survey in northwestern Zhejiang Province |
ZHAO Bo1, YU Lei2, QIU Jun-Ting1, SHI Cheng-Long1, ZHANG De-Hui1 |
1. College of Earth Science and Resource, China University of Geosciences, Beijing 100083, China;
2. China Society of Engineering Blasting, Beijing 100142, China |
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Abstract With 1:200 000 stream sediment survey of copper in northwestern Zhejiang Province as an example, the authors used the content arrangement method to study the internal structural features of Cu geochemical anomalies delineated by the Fractal Summation Method in this area. It is the stability of fractal non-scale section that masks the internal spatial structure of the anomalous field, and the ignored fact therein is that such an internal structure can be manifested by a natural revelation or content arrangement (of copper from small to large content) of the original anomalous sample data itself, rather than an effort to overcome the stability of non-scale sections. Three lines of L1, L2, and L3 are used to fit the hierarchical evolution trends, namely the internal structure, of anomalous data, and therein, L1 specifies the primary anomaly, and L2+L3 specify the advanced anomaly. Studies show that the primary anomaly (L1) may correspond in general to a weak mineralization and essentially barren area, although it does contain some weak mineralization or several hidden ore spots; the secondary one (L2+L3) can be approximately or equally considered as the mineralized anomalous area, between which and the regional tectonomagmatic activity there is a further significant spatial correlation; some new undiscovered copper prospecting target was discovered at last on the basis of the study of the ore-controlling significance of magmatic source, tectonic transformation, and convergence of faults in this area.
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Received: 18 January 2014
Published: 10 April 2015
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